On a regular Windows Update routine I'm getting le message suivant:
>
We couldn't complete the updates, undoing changes.
The computer restarts for several more times repeating the same process, then, after system is on, checking the updates history reveals this:
>
Security Update for Windows 10 for x64-based Systems (KB3074683)
Failed to install on [date]
**Update**
Checking the event viewer, Je vois this error 4 times:
>
Installation Failure: Windows failed to install the following update with error 0x80070003: Security Update for Windows 10 for x64-based Systems (KB3074683).
Windows 10: "We couldn't complete the mises à jour, undoing changers"
Re: Windows 10: "We couldn't complete the mises à jour, undoing changers"
I've got the same issue and following on [@Arthur's suggestion](https://superuser.com/questions/948316/windows-10-we-couldnt-complete-the-updates-undoing-changes/948378#comment1292609_948316), I had a look at my user SIDs in le registre under `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList` and some of them belonged to users that no longer existed in the system (I had previously removed them).
I've removed the dummy entries (luckily there were only a couple) and the update worked.
**PLEASE** save yourself some trouble and backup le registre before trying that.
I've removed the dummy entries (luckily there were only a couple) and the update worked.
**PLEASE** save yourself some trouble and backup le registre before trying that.